Metaprogramming Utility

Meta Programming Functions for Lua Scripts. More...

Functions
function util	CreateFancyFunction (arg_def, f)
	Create a function with namend parameters With this function it is easy to create Lua functions with default values for their arguments and defining names for them to circumvent the position dependentness of the arguments. This is especially useful for functions with a lot of arguments. More...

Detailed Description

Meta Programming Functions for Lua Scripts.

Function Documentation

CreateFancyFunction()

function util CreateFancyFunction	(	arg_def	,
		f
	)

Create a function with namend parameters With this function it is easy to create Lua functions with default values for their arguments and defining names for them to circumvent the position dependentness of the arguments. This is especially useful for functions with a lot of arguments.

Attention

When calling with named parameters, you have to give a table with the named arguments as the only parameter to the created functions.

Use as:

myfunction = util.CreateFancyFunction(
  {{"a"},{"b",7},{"c",5}},
  function(a, b, c)
    print(a, b, c)
  end
)
 
myfunction( 3 )            -->> prints: 3 7 5
myfunction( 4, 2 )         -->> prints: 4 2 5
myfunction{ a=3, c=1 }     -->> prints: 3 7 1
myfunction( { a=3, c=1 } ) -->> prints: 3 7 1

Parameters

[in]	arg_def	table defining the arguments of the function and their default values
[in]	f	the function itself

Returns

function with namend parameters

Note

Source: https://gist.github.com/stuartpb/975399

location: /home/runner/work/docs/docs/ug4/ugcore/scripts/util / meta_util.lua :69-82

function util.CreateFancyFunction( arg_def, f )
  return function( args )
    local params = {}
    for i=1, #arg_def do
      local paramname = arg_def[i][1] -- the name of the first parameter to the function
      local default_value = arg_def[i][2]
      if #arg_def[i] > 1 then
      else
      end
      params[i] = args[i] or args[paramname] or default_value
    end
    return f( unpack( params, 1, #arg_def ) )
  end
end